[PATCH 1/3] ARM: dts: imx7s: add snvs clock to pwrkey

André Draszik
2020-01-30T20:45:32Z

On i.MX7, the SNVS requires a clock. This is similar to the clock
bound to the SNVS RTC node, but if the SNVS RTC driver isn't enabled,
then SNVS doesn't work, and as such the pwrkey driver doesn't
work (i.e. hangs the kernel, as the clock isn't enabled).

Also see commit ec2a844ef7c1
("ARM: dts: imx7s: add snvs rtc clock")
for a similar fix.

Signed-off-by: André Draszik <git@andred.net>
Cc: Anson Huang <Anson.Huang@nxp.com>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: "Horia Geantă" <horia.geanta@nxp.com>
Cc: Aymen Sghaier <aymen.sghaier@nxp.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: linux-crypto@vger.kernel.org
Cc: devicetree@vger.kernel.org
Cc: linux-input@vger.kernel.org
---
.../devicetree/bindings/crypto/fsl-sec4.txt | 17 +++++++++++++++++
arch/arm/boot/dts/imx7s.dtsi | 2 ++
2 files changed, 19 insertions(+)

diff --git a/Documentation/devicetree/bindings/crypto/fsl-sec4.txt b/Documentation/devicetree/bindings/crypto/fsl-sec4.txt
index 2fe245ca816a..755c2838d658 100644
--- a/Documentation/devicetree/bindings/crypto/fsl-sec4.txt
+++ b/Documentation/devicetree/bindings/crypto/fsl-sec4.txt
@@ -449,6 +449,19 @@ System ON/OFF key driver
Value type: <phandle>
Definition: this is phandle to the register map node.

+ - clocks
+ Usage: optional, required if SNVS LP requires explicit
+ enablement of clocks
+ Value type: <prop_encoded-array>
+ Definition: a clock specifier describing the clock required for
+ enabling and disabling SNVS LP RTC.
+
+ - clock-names
+ Usage: optional, required if SNVS LP requires explicit
+ enablement of clocks
+ Value type: <string>
+ Definition: clock name string should be "snvs-pwrkey".
+
EXAMPLE:
snvs-pwrkey@020cc000 {
compatible = "fsl,sec-v4.0-pwrkey";
@@ -456,6 +469,8 @@ EXAMPLE:
interrupts = <0 4 0x4>
linux,keycode = <116>; /* KEY_POWER */
wakeup-source;
+ clocks = <&clks IMX7D_SNVS_CLK>;
+ clock-names = "snvs-pwrkey";
};

=====================================================================
@@ -547,6 +562,8 @@ FULL EXAMPLE
interrupts = <0 4 0x4>;
linux,keycode = <116>; /* KEY_POWER */
wakeup-source;
+ clocks = <&clks IMX7D_SNVS_CLK>;
+ clock-names = "snvs-pwrkey";
};
};

diff --git a/arch/arm/boot/dts/imx7s.dtsi b/arch/arm/boot/dts/imx7s.dtsi
index 1b812f4e7453..6240a6f58048 100644
--- a/arch/arm/boot/dts/imx7s.dtsi
+++ b/arch/arm/boot/dts/imx7s.dtsi
@@ -614,6 +614,8 @@
linux,keycode = <KEY_POWER>;
wakeup-source;
status = "disabled";
+ clocks = <&clks IMX7D_SNVS_CLK>;
+ clock-names = "snvs-pwrkey";
};
};

--
2.23.0.rc1